226 ANNALS OF SCOTTISH NATURAL HISTORY 



Deschampsia csespitosa, Beauv. 



Holcus lanatus, L. 



Avena. As in 1897. 



Arrhenatherum avenaceum, Beauv. 



Dactylis glomerata, L. 



Poa annua, L. - 



P. nemoralis, L. More common. 



P. pratensis, L. + 



P. trivialis, L. 



Glyceria distans, Wahlenb. + 



Festuca elatior, Z., and c. pratensis, Huds. 



Bromus sterilis, L. One plant. 



B. mollis, L. 



Lolium perenne, L. Rather more abundant, 

 e. italicum (Braun). Several examples. 



Agropyron repens, Beauv. Still increasing, the varieties in pro- 

 portions as before. 



Triticum vi/tgare, Vill. - 



Secale cereale, L. - ; Hordeum distichum, L. ; H. hexastichum, L. 



Equisetum arvense, L. A fair-sized patch of barren stems was 

 observed in July for the first time on this ground. 



A comparison of the above list with those for previous 

 years confirms the general conclusions stated in them as to 

 the inability of most of the introduced plants to hold their 

 ground against the encroachments of the native weeds, 

 especially of the larger forms, and of those that grow socially, 

 such as Conium and the grasses. 



The absence of a very large number of the commonest 

 weeds of waste places is still very noteworthy, as is also 

 the continued scarcity of some that have occurred on the 

 ground year after year, and that one might have anticipated 

 would soon become abundant after they had gained a footing. 

 As a whole, the vegetation is year by year becoming more 

 stable in its character, the changes constantly diminishing ; 

 though a few tend to drop out and casuals may not reappear, 

 while others appear for the first time or recur after an 

 interval of a year or more. 



Comparing the list of this year with that of 1897 we 



